A cold front from Lake Superior across northwest Iowa coupled with an upper level low over southwest Ontario with an associated short wave dropping across southern Minnesota sparked the development of thunderstorms during the afternoon and evening of July 24. Severe storms producing copious amounts of large hail up to the size of a tennis ball and damaging wind gusts between 60 and 90 mph were common. An isolated tornado touched down near Princeton, IL around 950 pm.

Event Narrative

Golf ball-sized hail fell about 3 miles south of Stockton, IL around 609 pm July 24.